આકૃતિમાં દર્શાવ્યા પ્રમાણે ચેસ બોર્ડમાંથી કોઈપણ બે ચોરસની યાર્દચ્છિક રીતે પસંદગી કરવામાં આવે છે તો તે બે ચોરસમાં એક બાજુ સામાન્ય હોય તેની સંભાવના મેળવો.

A \(\frac{2}{7}\)
B \(\frac{1}{18}\)
C \(\frac{1}{7}\)
D \(\frac{1}{9}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{1}{18}\)

Step-by-step Solution

Detailed explanation

Total ways of choosing square \(={ }^{64} \mathrm{C}_{2}\) \(=\frac{64 \times 63}{2 \times 1}=32 \times 63\) ways of choosing two squares having common side \(=2(7 \times 8)=112\) Required probability \(=\frac{112}{32 \times 63}=\frac{16}{32 \times 9}=\frac{1}{18}\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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